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COBEM 2019
25th International Congress of Mechanical Engineering
Effect of the Standard Deviation of Clearance Distributions on Asymmetric Tilting-Pad Journal Bearings
Submission Author:
Rodrigo Nicoletti , SP , Brazil
Co-Authors:
Heitor Antônio Pereira da Silva, Rodrigo Nicoletti
Presenter: Heitor Antônio Pereira da Silva
doi://10.26678/ABCM.COBEM2019.COB2019-0471
Abstract
The clearance and the pre-load of Tilting-Pad Journal Bearings (TPJBs) are significantly affected by dimensional uncertainty, thus possibly leading the rotor-bearing system to an asymmetric configuration, i.e. the TPJB can present different clearances among its pads. Such asymmetry of the TPJB has consequences for the resultant dynamic coefficients of the rotor-bearing system. This work contributes to the further understanding of the dynamic behavior of TPJBs subjected to dimensional uncertainty. For that, it focuses on the question: What happens if the standard deviation of the clearance distribution changes? The results show that the dynamic coefficients still scatter around the mean value of the distribution, and this scattering of the dynamic coefficients is still limited by the values obtained from a symmetric TPJB with minimum and maximum clearances. Therefore, it is still possible to estimate the distribution of dynamic coefficients by fitting a Gamma distribution from three simulations runs of the symmetric case.
Keywords
lubricated bearings, uncertainty, Stochastic Analysis, thermohydrodynamics, dynamic coefficients
